JPS60188775A - Controller for operation of refrigerator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Industrial applications The present invention relates to an operation control device for a refrigerator.

Conventional Structure and Its Problems The structure of a conventional refrigerator operation control device is shown in FIG. 1 is an internal temperature detection means for detecting the temperature inside the refrigerator, 2 is a set temperature detection means for detecting the set temperature, and 3 is 1
A defrosting end detection means detects m'' and outputs a defrosting start signal when a predetermined frost m'' is reached; 4 detects when the temperature of the cooler reaches a predetermined temperature or higher during defrosting; It is a defrosting end detection means that ends defrosting. 6 is a control means and an input terminal Io.

11, I2. It has I3, output terminal O○, and CM.

Then, the inputs from the chamber temperature detection means 1 and the set temperature detection means 2 are compared, and the compressor 6 is operated according to the magnitude of both temperatures.
Determine the operating frequency.

For example, if the temperature inside the refrigerator is <set temperature>, the compressor 6 is stopped, and if the temperature inside the refrigerator is set temperature, the compressor 6 is stopped at t1.
It decides to turn the compressor 6 once at a high frequency, and when the temperature inside the refrigerator is equal to the set temperature, to turn the compressor 6 once at a low frequency, and outputs it from the output terminal Φ0.
) 7 is an operation control means (hereinafter referred to as frequency control means),
In response to the frequency determined by the control means 6, the compressor 6 is operated at that frequency by, for example, a transistor inverter.

Reference numeral 8 denotes a relay which has a contact 8' and is used to rotate the contact 8' by 0N10FF'l and the defrosting heater 9 by 0N10FF by the output of the control means 6. .

In such a configuration, when the power is turned on for the first time in the refrigerator, the temperature inside the refrigerator is almost the same as the outside temperature, and the temperature inside the refrigerator is U degrees > set temperature, and the control means 511SJ: compressor 6 is operated at high frequency. 4. decide to
This allows the compressor to operate at a high frequency. FIG. 2 shows changes in the motor current of the compressor 6 at this time. Point A in FIG. 2 is the peak value of the motor current. The time T from the start of underground operation until the current value reaches its peak is usually about 30 minutes, and varies depending on the outside temperature, the inside temperature, and the cooling system.

Therefore, a very large current will flow at point A, and elements such as transistors that can withstand this current must be used for the operation control means 7, making it heavy. 〕is.

Purpose of the Invention Therefore, the present invention reduces the current peak value at point A shown in FIG. It is an object of the present invention to provide a control device that can cope with changes in outside air ff11'l + internal temperature and cooling system.

Structure of the Invention To achieve this object, the present invention detects the compressor motor current, changes the compressor operating frequency when the current value reaches a predetermined value, and reduces the current peak value after power is turned on. Outside temperature.

This operation is stable even with changes in the temperature inside the refrigerator and the cooling system.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will now be described with reference to the accompanying drawing V. FIG. 3 is a diagram showing the configuration of an embodiment of the present invention, in which internal temperature detection means 1. Set temperature detection means 2° Defrosting start detection means 3. Exclusion 111 end detection means 4. Control means 5. Comprenoza 6. Operation control means 7. Relay 8. The heater 9 has the same configuration as the conventional example.

Reference numeral 10 denotes a current detection means for detecting the current of the compressor 6 using, for example, a CT (current transformer) 10' and sending an output to the control means 6.

The operation will be explained below with reference to FIG.

In one step, the temperature inside the refrigerator detected by the temperature inside the refrigerator 1 is inputted to the input terminal IO.

Next, the set temperature is detected by the set temperature detection means 2 at the second step.
Input this set temperature from input terminal 1. Next, in 3 steps, the internal temperature input in 1 step is compared with the set temperature input in 2 steps with the knob, and in 4 steps, the operating frequency of the compressor 6 is determined. In step 5, the motor current value of the compressor 6 detected by the current detection means 10 is input. In step 6, it is determined whether the current value inputted in step 6 is larger than a predetermined value, and if it is thick or equal, proceed to step 7, step B. If it is smaller, proceed to step 8, and the frequency determined in step 4 is determined. It is output to the operation control means 7. Result 8 determined by these 6 steps and steps
If the step V is advanced, the motor current value is in a state where there is sufficient margin for the elements of the operation control means 7, and the determined frequency is outputted at that time. Next, the process proceeds to step 9, and it is determined whether or not defrosting has started based on the output of the defrosting start detection means 3. If defrosting has started, the process proceeds to step 10,
If not started, return to step 1. Usually repeats the same actions. When the compressor 6 is operated as described above and the cooling operation is performed when the power is turned on or when the operation is completed after defrosting, the cooling load of the refrigerator increases to the extent that the motor current value of the compressor 6 exceeds a predetermined value. The process proceeds from the 6th step to the 7th step, where the control means 5 outputs the intermediate frequency to the operation control means 7 for the frequency determined in the 4th step, and the process proceeds to the 9th step. If there is a difference in detecting the start of defrosting in 9 steps, proceed to 1o step, and complete in 10 steps.

The operating frequency of the bus 6 is set as Ollz (OFF) and is outputted to the operation control means 7 from the output terminal 0o. Next, in step 11, a defrosting signal is output from the output terminal 01, the relay 8 is turned on, and the heater 9 is energized to start defrosting. Next 1
If there is no output from the defrosting end detecting means 4 in step 2, the process returns to step 12 and the output of the defrosting end detecting means 4 is checked again, and defrosting is continued during this period. If there is an output, the process advances to step 13 and the heater 9' (zO
F'F(, Finish defrosting and return to 1st stage.

As shown in FIG. When the temperature difference between the points 1 and 1 disappears, the load on the compressor 6 increases and the current f1 reaches a predetermined value, that is, point B in FIG.
At this time, the operating frequency of the compressor 6 is operated at an intermediate frequency to control the current value ff:e. Furthermore, if the current value falls below a predetermined value, there will be no significant effect on the cooling performance since the operating frequency is determined by the original internal temperature and the set temperature.

Therefore, by detecting the motor current of the compressor 1/noza 6 and operating the compressor 6 at an intermediate frequency when the current value is higher than a predetermined value, the conventional method shown in FIG.
It is possible to reduce the peak current as shown in FIG. −):
Even if the time until the current peak changes due to changes in the outside temperature, internal temperature, or cooling system, excessive current can be prevented and stable operation is possible. Furthermore, it is possible to reduce the peak current not only when the power is turned on but also during operation after defrosting.

In addition, in Fig. 6 a and C, A indicates the characteristics of the present invention; It indicates temperature.

Effects of the Invention As is clear from the above explanation, the refrigerator operation control device of the present invention determines the operating frequency of the compressor based on the internal temperature of the refrigerator and the set temperature, detects the motor current of this compressor, and controls the operating frequency of the compressor. Since the frequency is controlled by changing the frequency, elements such as transistors used in the operation control means can be made to have small capacitance and can be made inexpensive.

In addition, stable operation can be achieved even with changes in outside temperature, internal temperature, and cooling system.

[Brief explanation of the drawing]

Figure 1 shows the configuration of a conventional refrigerator operation control device; Figure 2 shows the change in motor current after power is turned on using the conventional control method; A block diagram showing an embodiment of the refrigerator operation control device of the present invention,
FIG. 4 is a flowchart, and FIG. 5 is a diagram showing changes in motor current when the operation control device of the present invention is used. 1. - Inside temperature detection means, 2.. Set temperature detection means, 5.. Control means, 7.. Operation control means, 10
- current sensing means; Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure I! , Minamoto Nozohito Figure 4 Figure 5

Claims (2)

[Claims] (1) An internal temperature detecting means for detecting the internal temperature, a set temperature detecting means for detecting the set temperature of the internal refrigerator, and a current detecting means for detecting the motor current of the compressor of the refrigerator;
nff storage internal temperature detection means, front R12 set temperature detection means, and control means for determining and sending out the operating frequency of the compressor based on inputs from the R12 set temperature detection means and the current detection means; An operation control device for a refrigerator, comprising an operation control means for operating a compressor, which changes and controls the operating frequency of the compressor determined by the internal temperature and the set temperature when the motor current of the compressor exceeds a predetermined value. . (2) Claim 1 which reduces and controls the operating frequency of the compressor determined by the internal temperature and the set temperature when the compressor motor current exceeds a predetermined value.
The operation control device for the refrigerator described in Section 1.